Creditors are the same the world over, they want their money back without the trouble and expense of having to chase you for it.
That said, they are also prepared to be reasonable, and take each case on its merits.
You have clearly demonstrated that you have a responsible attitude to your debts, and are making every effort to repay promptly, but you are entering into a spiral of exhaustion and deprivation that is only going to get worse, and looking ahead - as your creditors will do - this could easily result in illness or depresion which could put one or both of you out of work, which is a situation they would want to avoid, both from a business and a humanitarian perspective.
You need some professional advice on how to re-strucutre your payments into a more managable amount - as advised the CAB will assist, or the Govcernment Debt lines will help you by negotiating for you.
From your position, where you arer keen to pay, but struggling, you are in a far stronger position than a couple who have ignored everything, and are a week away from re-possessiona and finally getting round to addressing the issues.
I am sure you will be able to re-arrange your payments, which may mean you pay more in the long run, but think of it as simply buying money (as paradoxical as that sounds!) and work on the principle of being able to live, not exist, while you get yourselves turned around.
Good luck.